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G. BEHRNS.V

Self Acting Screen Gleaner for Millstone Ventilating Y Apparatus, 8vo.

No. 239,640. Patented April 5,1881.

Patented April 5,1881.

Apparatus, 8vo.

N,PETERS. Pno'mumosmvnin. WASHINGTON. D C- city of Lnbeck, in the Empire of Germany,

- cured to the frame of thel dust-screen; P, the

4valve and operating the rapping-hammer inA UNITED STATES VPATENT Genion..

VGUSTAV BHRNS, OF LBECK, GERMANY.

SELF-ACTING SCREEN-CLEANER FOR MILLSTONE-VENTILATI'NG APPARATUS, dc.

sPEcIFIcA'rIoN forming part of Letters Patent No. 239,640, dated Aprn 5, 1881. Application tiled September 3, 1880. (No model.) `Patented in Germany April 25, 1880.

To all. whom t't may concern Be it known that I, GUSTAV BHRNS, of the have invented an Improvement in Self-Acting- Screen-Gleaners for Millstone-Ventilating Apparatus, of which the following is a specification.

My invention consists in an apparatus, described in the following, for automatically re-` moving atl certain intervals the flour-dust ad-` hering-to the flannel screen which is used in i millstone-ventilating apparatus for separating the fine flour-dust from the air-current. This is done by the blow ot' a hammer against a ra-pping-pin fastened to the frame which holds the dustscreen. This operation should be preceded by a `shutti ng ott' of the air-current, because otherwise the iionrdust would not drop off the dust-filter, the air-current holding the small particles of flour against the screen. After the cleaning has been accomplished the,` air-current is turned on again in order to venj tilate the millstones.

The apparatus is shown in detail on Sheet` l and in general arrangement on Sheet Il. Sheet III shows, in detail, the operation of the l device for closing and opening the exhaustalternate times.

B is the millstoneurb or hoop; S, the airpipe; r, the throttle-valve, by which the airpipe S can be closed; t, the rapping-pin sehammer; g g, a segment fastened to the shaft of the throttle-valve and bearing two rollers, h 7L, and a stay-bolt, t'.

mf n is a lever loosely fitted to the shaft f. The arm fm of this lever can swing between the one roller, h, and the stay bolt t'. The other arm, f n, is connected by the rope x to the hammer-lever y of the hammer P.

s s is a double-sided chain, with the connecting-bolts o o and the hook z. This chain carries on its one end the weight Q. The other end is connected to the lever e by a rope running over the roller u, Figures 4 and 5. This lever e turns on its end 7c, and is bifurcated on its other end, d.

a a, Figs. 4 and 5, Sheet II, is an endless band or wire rope, held and guided by the rollers c c, and moved slowly bythe counterl shaft L. The band or rope a t is provided with a knob or knot, b, which latter has a diameter sufficiently large as not to go through the bifurcate'd end d ofthe lever e.

Kis a weight suspended on a roller, and serving to give the band or rope et a a suitable tension. The wire rope or band act being set in motion by the revolving counter-shalt L, the knot or knob Z1, on entering the bifurcated end d ofthe lever c, will push the latter from position l to position Il, Fig. 5, Sheetll, when the knot'b can slip off the bifurcaied end d. By this motion of the levere the wire rope or cord s s, which is held stretched by the weight Q, is pulled in the direction of the arrow, Fig. 4. The effect of this action isshown on Sheet III. Fig. 6 shows the position ot' the mechanism when .the exhaust-valve r is held open by the weight Q, the hook z of the chain or rope s s being engaged in the stay-bolt t'. As soon as the chain is pulled towards', as heretofore described, the hookz has a tendency to withdraw from the stay-bolt t'.

On examinii'igthe drawings it will be noticed that the stay-bolt t' and the rollers h'h are so located on the plate g g that the chain s s assumes an eccentrica] position on the spindlef,

the end s having a greater leverage than the end s. This construction will produce a tendency of the segment-plates g g to turn in the direction of the greater leverage, and instead of the hook z leaving the stay-bolt t', the latter will follow the motion of the hook z until the throttle-valve is closed, (see Fig. 7,) and a further motion of the segment-plates g g is thus arrested. The motion of the chain s s, as above described, will therefore cause a closing of the throttle-valve during the rst part ot' its motion. After the valve has been closed the chain will begin to move over the rollers 71; It, and the first bolt o, on meeting the arm mf of the lever mf at, will raise the hammer by means of the cord or rope m, connectingthe hammer-lever y with the end n of the lever n f m. The hammer, after the first of the bolts o o has passed the end m of the leverf m, will drop down and give al blow against the pin t, therebyimpartinga rappingmotion to the dusttilter frame. The Hour-dust loosely adhering to the screen, the air-current, being suspended by the closure of the throttlevalve, will fall IOO down from the screen upon the millstone, whence it is thrown off by centrifugal force, falling into the open space between the millstone and the curb or h'oop, from where it is carried off with the chop in the usual manner. This operation will be repeated by the second bolt o striking against and moving the lever mfn; The number of blows will depend on the number of bolts 0 inserted in the chain s s and brought into action, as described. When the knob b of the band or rope a a passes the bifurcated end d of the lever c, the latter is drawn back to its original position I, Fig. 5, Sheet II, by the weight Q attached to the rope or chain s s. The peculiar curved shape of the lever m j", Fig. 1, Sheet I, permits the bolts o o to slip past this lever at the return motion of the chain s s. During the latter part of its return motion the rope or chain s s, by means of the hook z, engaging in the sta-ybolt t', will reopen the throttle-valve again, and thus renew the action of the air-current.

It is evident that either one or a series of millstones of anynumber can be provided with the self-acting screen-cleaner above described, the endless band or rope a a, serving' as a motor for the several levers e. The intervals in which the closing of the throttlevalves, 'the rapping' of the dust-filters, and

again, the reopening of the throttle-valves takes place, are dependent upon the speed and the length of travel of the band or rope a a. Where a large number of the above-described self-acting screen-cleaners is driven by one band or rope, two or more knobs, b, may be used. 4

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In com bination with the traveling knotted rope a a, the pivoted bifnrcated leverl c, and the counterweigbted rope or chain s s thereto attached, and the throttle-valve r, and the means described for operating the same, whereby the motion of the traveling rope and counter-weight causes the bifurcated lever to automatically open and close the throttle-valve, as set forth. l

2. The segment plate or casting g g, rigidly secured to the shaft of the valve r', and provided with the rollers h h and the stay-bolt fi, arranged with the relative eccentricity described, in combination with the counter- Weighted chain or rope s s, whereby the pressure of the chain or rope, when drawn across the stay-bolt, as pointed out, effects the closing of the valve, as set forth.

3. The segment plate or casting g g, rigidly secured to the shaft of the valve r, and provided With the rollers h it and stay-bolt i, in combination with the double-ended lever m f u, swinging loosely upon the valve-shaft, having the hammer-cord x attached to the end fn thereof', and having the end m thereof' adapted to enga-ge and disengage with the connectingbolts o ofthe chain s s, as described, whereby, when the throttle-valve has been automatically closed, the dust-intercepting screen is automatically shaken, substantially as set forth.

4. The knotted traveling rope and the pivl oted bifurcated lever, the counterweighted rope or chain .5" s, having connecting-boltso and engaging-hook z, in combination with the segment plate or casting g g, provided With the stay-bolt t', whereby the throttle-valve is positively reopened by the return movement ofthe counterweighted rope or chain after the screencleaning has been effected, as set forth.

In testimony whereof' l have signed my name to this specitication in the presence of two subscribing witnesses.

Gusmv' BEHnns.

Witnesses HUGO BREHMER, GUsTAV UNRUH. 

